y^2-4y-20=3y+2

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Solution for y^2-4y-20=3y+2 equation:


Simplifying
y2 + -4y + -20 = 3y + 2

Reorder the terms:
-20 + -4y + y2 = 3y + 2

Reorder the terms:
-20 + -4y + y2 = 2 + 3y

Solving
-20 + -4y + y2 = 2 + 3y

Solving for variable 'y'.

Reorder the terms:
-20 + -2 + -4y + -3y + y2 = 2 + 3y + -2 + -3y

Combine like terms: -20 + -2 = -22
-22 + -4y + -3y + y2 = 2 + 3y + -2 + -3y

Combine like terms: -4y + -3y = -7y
-22 + -7y + y2 = 2 + 3y + -2 + -3y

Reorder the terms:
-22 + -7y + y2 = 2 + -2 + 3y + -3y

Combine like terms: 2 + -2 = 0
-22 + -7y + y2 = 0 + 3y + -3y
-22 + -7y + y2 = 3y + -3y

Combine like terms: 3y + -3y = 0
-22 + -7y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '22' to each side of the equation.
-22 + -7y + 22 + y2 = 0 + 22

Reorder the terms:
-22 + 22 + -7y + y2 = 0 + 22

Combine like terms: -22 + 22 = 0
0 + -7y + y2 = 0 + 22
-7y + y2 = 0 + 22

Combine like terms: 0 + 22 = 22
-7y + y2 = 22

The y term is -7y.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y + 12.25 + y2 = 22 + 12.25

Reorder the terms:
12.25 + -7y + y2 = 22 + 12.25

Combine like terms: 22 + 12.25 = 34.25
12.25 + -7y + y2 = 34.25

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = 34.25

Calculate the square root of the right side: 5.852349955

Break this problem into two subproblems by setting 
(y + -3.5) equal to 5.852349955 and -5.852349955.

Subproblem 1

y + -3.5 = 5.852349955 Simplifying y + -3.5 = 5.852349955 Reorder the terms: -3.5 + y = 5.852349955 Solving -3.5 + y = 5.852349955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = 5.852349955 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = 5.852349955 + 3.5 y = 5.852349955 + 3.5 Combine like terms: 5.852349955 + 3.5 = 9.352349955 y = 9.352349955 Simplifying y = 9.352349955

Subproblem 2

y + -3.5 = -5.852349955 Simplifying y + -3.5 = -5.852349955 Reorder the terms: -3.5 + y = -5.852349955 Solving -3.5 + y = -5.852349955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = -5.852349955 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = -5.852349955 + 3.5 y = -5.852349955 + 3.5 Combine like terms: -5.852349955 + 3.5 = -2.352349955 y = -2.352349955 Simplifying y = -2.352349955

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.352349955, -2.352349955}

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